If you are sure the base is clear, and that the flexible hose and attachment tube are clear, the only other common place for a blockage is the swivel neck that joins the base to the bottom of the dust bag housing. Here's what to do:
Press the housing release button (front bottom of bag housing) and lift off the bag housing from the base. This can be quite hard (three or four hands would be helpful) but be sure to lift straight. When you've got the bag housing off, release the foot pedal and lower the swivel neck to 45 degrees. Check inside the swivel neck channel closest to the foot pedal, and clean it out as necessary.

If this doesn't work, please post again and I'll see what else I can do... If it does help, please rate me!

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Try removing your hose from the bag housing (pinch retaining ring and pull out) and re-inserting in reverse order. Turn the vacuum on and suck the clog into the bag. This will usually clear a clog from the hose. If the clog is in the power head (base), you can usually access it from the top side of the swivel neck or the orange access door on the bottom of the chassis.

First, pull out the hose, turn the unit on, check for an obstruction in the hose. (unclog and obstruction)

Separate the body from power nozzle. Check for obstruction in the air hole passage.

Pull and clean both filters in the unit. The inside white long carriage and the exhaust filter located above indicator panel. (nozzle body)

If this is not working. think about where and how dirt is carried or passes from the front floor nozzle or through the hose.Somewhere in the unit the it is clogged. The red light censers a full bag (we know that's not the issue) or an obstruction to the normal air flow.

Last Resort contact http://www.sebo.us/contact_us.aspx

In closing: I've been selling and repairing vacuums for over 30 years. Of all the 5 major brands that I sell. Sebo is by far the, best product on the market.

So when this light is displaying, it's says "Bag Full or Clog" on the indicator. If you have changed the bag, and it's still showing this light, it means that you either have a clog in the vacuum, or your filters are dirty, which is reducing the suction and making the machine think that your bag is full. If your machine is actually cutting off, this indicates that your machine is definitely clogged, or something is stuck inside which is causing the motor to not get air flow, and cauing the machine to over heat. When it shuts off like this, it's a protection system that prevents any damage from happening to the motor when it can't breathe and starts to overheat.

My guess is that there is probably a clog in the machine somewhere, or the filters are dirty. Here's what you may do to diagnosis the machine, and try to isolate the clog to find out where it is in the vacuum.

Step 1. Remove the hose and wand assembly from the vacuum cleaner completely. You may do this by pressing the two tabs on the end of the hose that plugs into the vacuum cleaner:

With the hose and the wand removed from the vacuum, it should look like this:

Step 2. Now turn the vacuum cleaner on and check to see if the red light comes on while the hose and the wand have been removed. If the light comes on, then this indicates that your filter is dirty (or the PCB electric board is bad if the filter is clean) and needs to be replaced.

Step 2. Re-attach the hose and wand back on the vacuum, but just the end of the hose that goes into the vacuum cleaner, leave the wand out of the vacuum cleaner so it looks like this:

Turn the machine on now as if you were using the attachment hose to clean corners or above the floor and see if the red light comes on here. Also listen to the noise the motor makes and see if the noise changes when you put the hose back on the vacuum cleaner. If the red light appears, or if the motor makes a higher pitched noise now, then this indicates that you have a clog in your hose or wand. You may verify this by remove the hose again from the vacuum, and also removing the wand from the hose by pressing the hose release button on the wand and pulling the hose out of the wand. Look down both of the parts and see if you can see thru both sides. If you're not able to see light through the hose, or the wand, this indicates this is where the clog is. You may take a metal clothes hanger, and try removing the clog this way.

Step 3. If the red light did not display with the wand not inserted into the vacuum, put the wand back into the vacuum cleaner as if you were vacuuming the floors:

Turn the machine on, and see if the red light comes on in this position. If the light does come on, then this indicates that you have a clog in the bottom of the vacuum cleaner. To check and see the clog in the bottom of the machine, I find it easiest to remove the upper bag housing from the vacuum cleaner completely so you're just looking at the bottom power nozzle of the vacuum cleaner. There's a button at the bottom of the machine that is either a grey, or yellow color depending on what color your vacuum is. Simply press this button in, and lift upwards on the handle or the bag housing at the same time:

Step 4. After the bag housing has been removed, turn the lower part of the vacuum upside down so the brushes are facing upwards. There's a little orange flap on the bottom of the machine that is actually a clog port. Almost every time there is a clog in a Sebo, this is where I typically find the clog. Open up this orange colored trap door, and look to see if you can see any obstruction or clog underneath of here:

Step 5. You may rotate the neck of the power nozzle part towards you so that you may look inside to see if you see any obstructions inside:

Step 5. You may also remove the brushes from the vacuum and look behind the brushes at the suction port, or the area where the suction goes through the vacuum to see if you see anything obstructing the suction here.

These are really the only places that the Sebo can get clogged. If you checked all of these areas, and the red light is still displaying, this means that your PC Board that controls this indicator has gone bad, and needs to be replaced. If this is the case, please just reply to this repair using the comment field, and I'll be more then happy to help you through the replacement of replacing the PCB Board.

I hope this answer was helpful to you, and you were able to find the clog and fix the problem. If you found my repair helpful, please be sure to rate the repair by clicking the 4 thumbs up icons in the top right hand corner, or by leaving feedback for me. This is really what keeps repair professionals continue to post free repair solutions rather then just the paid questions. It's really appreciated when you take the time and do this if the repair was helpful.

So when this light is displaying, it's says "Bag Full or Clog" on the indicator. If you have changed the bag, and it's still showing this light, it means that you either have a clog in the vacuum, or your filters are dirty, which is reducing the suction and making the machine think that your bag is full. If your machine is actually cutting off, this indicates that your machine is definitely clogged, or something is stuck inside which is causing the motor to not get air flow, and cauing the machine to over heat. When it shuts off like this, it's a protection system that prevents any damage from happening to the motor when it can't breathe and starts to overheat.

My guess is that there is probably a clog in the machine somewhere, or the filters are dirty. Here's what you may do to diagnosis the machine, and try to isolate the clog to find out where it is in the vacuum.

Step 1. Remove the hose and wand assembly from the vacuum cleaner completely. You may do this by pressing the two tabs on the end of the hose that plugs into the vacuum cleaner:

With the hose and the wand removed from the vacuum, it should look like this:

Step 2. Now turn the vacuum cleaner on and check to see if the red light comes on while the hose and the wand have been removed. If the light comes on, then this indicates that your filter is dirty (or the PCB electric board is bad if the filter is clean) and needs to be replaced.

Step 2. Re-attach the hose and wand back on the vacuum, but just the end of the hose that goes into the vacuum cleaner, leave the wand out of the vacuum cleaner so it looks like this:

Turn the machine on now as if you were using the attachment hose to clean corners or above the floor and see if the red light comes on here. Also listen to the noise the motor makes and see if the noise changes when you put the hose back on the vacuum cleaner. If the red light appears, or if the motor makes a higher pitched noise now, then this indicates that you have a clog in your hose or wand. You may verify this by remove the hose again from the vacuum, and also removing the wand from the hose by pressing the hose release button on the wand and pulling the hose out of the wand. Look down both of the parts and see if you can see thru both sides. If you're not able to see light through the hose, or the wand, this indicates this is where the clog is. You may take a metal clothes hanger, and try removing the clog this way.

Step 3. If the red light did not display with the wand not inserted into the vacuum, put the wand back into the vacuum cleaner as if you were vacuuming the floors:

Turn the machine on, and see if the red light comes on in this position. If the light does come on, then this indicates that you have a clog in the bottom of the vacuum cleaner. To check and see the clog in the bottom of the machine, I find it easiest to remove the upper bag housing from the vacuum cleaner completely so you're just looking at the bottom power nozzle of the vacuum cleaner. There's a button at the bottom of the machine that is either a grey, or yellow color depending on what color your vacuum is. Simply press this button in, and lift upwards on the handle or the bag housing at the same time:

Step 4. After the bag housing has been removed, turn the lower part of the vacuum upside down so the brushes are facing upwards. There's a little orange flap on the bottom of the machine that is actually a clog port. Almost every time there is a clog in a Sebo, this is where I typically find the clog. Open up this orange colored trap door, and look to see if you can see any obstruction or clog underneath of here:

Step 5. You may rotate the neck of the power nozzle part towards you so that you may look inside to see if you see any obstructions inside:

Step 5. You may also remove the brushes from the vacuum and look behind the brushes at the suction port, or the area where the suction goes through the vacuum to see if you see anything obstructing the suction here.

These are really the only places that the Sebo can get clogged. If you checked all of these areas, and the red light is still displaying, this means that your PC Board that controls this indicator has gone bad, and needs to be replaced. If this is the case, please just reply to this repair using the comment field, and I'll be more then happy to help you through the replacement of replacing the PCB Board.

I hope this answer was helpful to you, and you were able to find the clog and fix the problem. If you found my repair helpful, please be sure to rate the repair

So when this light is displaying, it's says "Bag Full or Clog" on the indicator. If you have changed the bag, and it's still showing this light, it means that you either have a clog in the vacuum, or your filters are dirty, which is reducing the suction and making the machine think that your bag is full. If your machine is actually cutting off, this indicates that your machine is definitely clogged, or something is stuck inside which is causing the motor to not get air flow, and cauing the machine to over heat. When it shuts off like this, it's a protection system that prevents any damage from happening to the motor when it can't breathe and starts to overheat.

My guess is that there is probably a clog in the machine somewhere, or the filters are dirty. Here's what you may do to diagnosis the machine, and try to isolate the clog to find out where it is in the vacuum.

Step 1. Remove the hose and wand assembly from the vacuum cleaner completely. You may do this by pressing the two tabs on the end of the hose that plugs into the vacuum cleaner:

With the hose and the wand removed from the vacuum, it should look like this:

Step 2. Now turn the vacuum cleaner on and check to see if the red light comes on while the hose and the wand have been removed. If the light comes on, then this indicates that your filter is dirty (or the PCB electric board is bad if the filter is clean) and needs to be replaced.

Step 2. Re-attach the hose and wand back on the vacuum, but just the end of the hose that goes into the vacuum cleaner, leave the wand out of the vacuum cleaner so it looks like this:

Turn the machine on now as if you were using the attachment hose to clean corners or above the floor and see if the red light comes on here. Also listen to the noise the motor makes and see if the noise changes when you put the hose back on the vacuum cleaner. If the red light appears, or if the motor makes a higher pitched noise now, then this indicates that you have a clog in your hose or wand. You may verify this by remove the hose again from the vacuum, and also removing the wand from the hose by pressing the hose release button on the wand and pulling the hose out of the wand. Look down both of the parts and see if you can see thru both sides. If you're not able to see light through the hose, or the wand, this indicates this is where the clog is. You may take a metal clothes hanger, and try removing the clog this way.

Step 3. If the red light did not display with the wand not inserted into the vacuum, put the wand back into the vacuum cleaner as if you were vacuuming the floors:

Turn the machine on, and see if the red light comes on in this position. If the light does come on, then this indicates that you have a clog in the bottom of the vacuum cleaner. To check and see the clog in the bottom of the machine, I find it easiest to remove the upper bag housing from the vacuum cleaner completely so you're just looking at the bottom power nozzle of the vacuum cleaner. There's a button at the bottom of the machine that is either a grey, or yellow color depending on what color your vacuum is. Simply press this button in, and lift upwards on the handle or the bag housing at the same time:

Step 4. After the bag housing has been removed, turn the lower part of the vacuum upside down so the brushes are facing upwards. There's a little orange flap on the bottom of the machine that is actually a clog port. Almost every time there is a clog in a Sebo, this is where I typically find the clog. Open up this orange colored trap door, and look to see if you can see any obstruction or clog underneath of here:

Step 5. You may rotate the neck of the power nozzle part towards you so that you may look inside to see if you see any obstructions inside:

Step 5. You may also remove the brushes from the vacuum and look behind the brushes at the suction port, or the area where the suction goes through the vacuum to see if you see anything obstructing the suction here.

These are really the only places that the Sebo can get clogged. If you checked all of these areas, and the red light is still displaying, this means that your PC Board that controls this indicator has gone bad, and needs to be replaced. If this is the case, please just reply to this repair using the comment field, and I'll be more then happy to help you through the replacement of replacing the PCB Board.

I hope this answer was helpful to you, and you were able to find the clog and fix the problem. If you found my repair helpful, please be sure to rate the repair by clicking the 4 thumbs up icons in the top right hand corner, or by leaving feedback for me. This is really what keeps repair professionals continue to post free repair solutions rather then just the paid questions. It's really appreciated when you take the time and do this if the repair was helpful.

So when this light is displaying, it's says "Bag Full or Clog" on the indicator. If you have changed the bag, and it's still showing this light, it means that you either have a clog in the vacuum, or your filters are dirty, which is reducing the suction and making the machine think that your bag is full. If your machine is actually cutting off, this indicates that your machine is definitely clogged, or something is stuck inside which is causing the motor to not get air flow, and cauing the machine to over heat. When it shuts off like this, it's a protection system that prevents any damage from happening to the motor when it can't breathe and starts to overheat.

My guess is that there is probably a clog in the machine somewhere, or the filters are dirty. Here's what you may do to diagnosis the machine, and try to isolate the clog to find out where it is in the vacuum.

Step 1. Remove the hose and wand assembly from the vacuum cleaner completely. You may do this by pressing the two tabs on the end of the hose that plugs into the vacuum cleaner:

With the hose and the wand removed from the vacuum, it should look like this:

Step 2. Now turn the vacuum cleaner on and check to see if the red light comes on while the hose and the wand have been removed. If the light comes on, then this indicates that your filter is dirty (or the PCB electric board is bad if the filter is clean) and needs to be replaced.

Step 2. Re-attach the hose and wand back on the vacuum, but just the end of the hose that goes into the vacuum cleaner, leave the wand out of the vacuum cleaner so it looks like this:

Turn the machine on now as if you were using the attachment hose to clean corners or above the floor and see if the red light comes on here. Also listen to the noise the motor makes and see if the noise changes when you put the hose back on the vacuum cleaner. If the red light appears, or if the motor makes a higher pitched noise now, then this indicates that you have a clog in your hose or wand. You may verify this by remove the hose again from the vacuum, and also removing the wand from the hose by pressing the hose release button on the wand and pulling the hose out of the wand. Look down both of the parts and see if you can see thru both sides. If you're not able to see light through the hose, or the wand, this indicates this is where the clog is. You may take a metal clothes hanger, and try removing the clog this way.

Step 3. If the red light did not display with the wand not inserted into the vacuum, put the wand back into the vacuum cleaner as if you were vacuuming the floors:

Turn the machine on, and see if the red light comes on in this position. If the light does come on, then this indicates that you have a clog in the bottom of the vacuum cleaner. To check and see the clog in the bottom of the machine, I find it easiest to remove the upper bag housing from the vacuum cleaner completely so you're just looking at the bottom power nozzle of the vacuum cleaner. There's a button at the bottom of the machine that is either a grey, or yellow color depending on what color your vacuum is. Simply press this button in, and lift upwards on the handle or the bag housing at the same time:

Step 4. After the bag housing has been removed, turn the lower part of the vacuum upside down so the brushes are facing upwards. There's a little orange flap on the bottom of the machine that is actually a clog port. Almost every time there is a clog in a Sebo, this is where I typically find the clog. Open up this orange colored trap door, and look to see if you can see any obstruction or clog underneath of here:

Step 5. You may rotate the neck of the power nozzle part towards you so that you may look inside to see if you see any obstructions inside:

Step 5. You may also remove the brushes from the vacuum and look behind the brushes at the suction port, or the area where the suction goes through the vacuum to see if you see anything obstructing the suction here.

These are really the only places that the Sebo can get clogged. If you checked all of these areas, and the red light is still displaying, this means that your PC Board that controls this indicator has gone bad, and needs to be replaced. If this is the case, please just reply to this repair using the comment field, and I'll be more then happy to help you through the replacement of replacing the PCB Board.

I hope this answer was helpful to you, and you were able to find the clog and fix the problem. If you found my repair helpful, please be sure to rate the repair by clicking the 4 thumbs up icons in the top right hand corner, or by leaving feedback for me. This is really what keeps repair professionals continue to post free repair solutions rather then just the paid questions. It's really appreciated when you take the time and do this if the repair was helpful.

Take the hose off and see if the light is still on or is it off. If it is off, then there is a clog in the hose. While the hose is off, drop something thru it and see if it comes out the other end. Press the retaining clip and the hose will disconnect. Separate the power head from the handle unit to make sure there is no clog by the brush roll. If it is still on then probably the computer controller, part # 5740ER has a problem. It is located in the power head.